Just spent some hours to find out why NPrinting On Demmand stopped working for one of our clients.

It turned out that their certificate used for SSL was updated. And since the 9000/9001 ports used by On Demand must be assigned to a correct certificate, the On Demand stopped working (and it was hard finding out why, no log entries anywhere).

The issue can be solved by three steps (in a console prompt with Admin permissions):